Liams



(No Model.)

G. H. WILLIAMS.

ELECTRIC TooL. No. 508,%l62. Patented Nov. 7, 1893.

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Y E TloNAL Lv oGnAPHING COMPANY wus New D c Mlumses UNITED STATES PATENT OFFICE.

GEORGEII, WILLIAMS, 'or NEW YORK, N. Y.

ELECTRIC Tool..

SPECIFICATION forming part of Letters Patent No. 508,262, dated November 7, 1893.

Applicant' filed Decanter 28. 1 892. sam No. 456.534. (No model.)

To all whom# may concern'.

Be it known that -I, GEORGEHENRY WIL LIAMS, of New York, county of New York,v

and State of NewYork, havein'vented certain new and useful Improvements in Electric Tools, of which thefollowing is a full, clear,

and exact description,referenceybeing hadlto the accompanyinghereof.

My invention relatesto improvements in' an electric tool, and consists in the novel arrangements of parts 'as will be more fully hereinafterv described and set forth in the claims.

The object of my invention is to construct a tool having a Vreciprocating plunger, actuated by an electric current, and adapted to take the place of the methods now employed in operating chisels, drills, and other analogous instruments, used in sculpturing, 'engraviug, repouss work, and in fact any and all kinds of artistic and ornamental work, as well as boiler calking, boiler` riveting, stone cutting and drilling, and coal and other mining.

For many dierent kinds of work, different sizes and forms of tools would be necessary, but the principle involved would be the same in all.

The tool is especially adapted for use by sculpturers and others in whose occupation the carving of marble, stone and metals enter largely, and it dispenses with the slow and laborious hand work hitherto experienced. In a tool for such use, the stroke can be made to vary from one-eighth of an inch to one inch, and at a speed ranging from three hundred to six hundred strokes per-minute.

Practical experience with the use of the tool has shown that it is particularly useful for the carving of letters'or other figures where it is necessary to follow accurately straight or curved lines.

To give an idea of the herein described tool I will say that its weight does not exceed six pounds, and as no movement of the same by the hand or arm is necessary, it will be seen that the weight. of the tool causes no inconvenience. The current for the operation of .the tool may be derived from cells of storage batteries or from a line wire, as is most conven ient to the user. L

drawings, forming apart. "a line B-B in Fig.3.

In case-the device were applied to the drilling of large stones, a larger construction would be necessary, this feature being controlled by thelnecessities of the occasion.

In the drawings: Figure l is a vertical de- .tail elevation of my complete invention. Fig. 2 isa vertical detail sectional View taken on Fig. 3 is a vertical detail sectional view taken on a line A-A in Fig. l. Fig. 4 is a diagrammatic View tracing the passage of the current to and from vapplied to a supporting device used to elevate the electric tool .over a piece of work and at the same time allowing its adjustment. Fig. 6 is an end elevation of the adj ustable support with the tool applied thereto. Fig. 7 is a detail. sectional view with parts broken away of the' supporting device. Fig. 8 is a detail view of a portion of a set screw which is used to determine the length of movement of the reciprocatory plunger, and showing the securance therein of a tip of insulating material. Fig. 9, is a detail View of the lower end ofthe shaft and its bearing in the lower cap'and showing the means for revolving said shaft when it is reciprocated.

Referring to the drawings: 1 indicates my complete invention comprising a cylindrical shell 2 open at yboth ends and provided with caps 3 and 4, the cap 3 tting upon the upper end of same andthe cap 4. upon the lower end of ysaid shell. The cap 3 consists of a hollow shell having the upper end 5 closed,tl1e said end being surmounted by a centrally located and upwardly projecting portion 6, circular in vcross section and provided with a vertical interiorly screw-threaded bore 7. The inner periphery of the shell-cap 3 is provided near vthe lower end with an annular cut out portion 8, which is adapted to fit over the upper end of the shell 2. Screws 9 secure said cap 3 upon the shell 2 and prevent'any movement of the same. The lower end of the shell 2 is provided with the cap 4 as hereinbefore the tool.-.- Fig. 5 is a top plan View of tool stated. Said cap 4 is narrower than the cap 31 3 and adapted to set entirely over the shell2 with the end lO of said cap et against the lower edge and its integral parts. Projecting down- IOO cular in cross-section and provided with a bore 12 and a counter bore 13, said counter bore 13 extending throughoutabout two thirds of the length of the projection 11 and the thickness of the plate 10. The cap 4 is secured upon the shell by means of screws 14 and said cap 4 in conjunction with the shell 2 and cap 3 form what may be substantially called a hollow tubular closed chamber.

The magnet or solenoid 15 consists of a tubular central spool having upon each end an annular plate or projection 16, which are of the same diameter as the interior of the shell 2 and into which said magnet 15 is adapted to iit. This construction makes what is substantially a spool, the wire 17 being wound in one direction upon the tubular portion 15 and between the plates 16. The inagnet is held in the casing2 by screws 18 which project through the plate 1() forming the end of the cap 4 and engaging in the lower end plate 16. The inner end 19 of the wire 17 is secured to the plate 16 at the upper end of the coil, the said inner end being insulated from contact with any of the balance of the wire in order to carry out the function of the magnet, as is well known in such constructions. The outer end 2O of said wires 17 is covered by additional insulation, consisting of a piece of tubing 21, which protects the wire from the coilthrough an opening in the shell 2. After leaving said shell 2 it passes upwardly and is held in a bracket arm 22 secured upon the upwardly projecting portion 6 upon the end of the cap 3. The other Wire necessary for the conducting of the current to the coil is secured under the head of a bolt 23 which passes through an opening in the top5 of the cap 3 at one side of the same and which is insulated from said cap by plates 24 above and below said plates 5 and an insulation tubing 25 upon the bolt 23 where it passes through said end plate 5. Secured upon the lower end of said bolt 23 and projecting inwardly to the center of the chamber 26 formed between the upper plate 16 of the magnet and the end plate 5, is a spring plate 27 provided upon its upper and lower sides with platinum contact plates. The spring-plate 27 is held upon said bolt and against the lower block of insulation 24 by a nut 28. Adapted to be vertically reciprocated in the bore 29 within? the shell 15 of the magnet is a tubular shaft 30 of soft iron upon the upper end of which is secured a circular disk or plate 31 upon the under side of which is secured a plate of yielding insulating material 32, which serves to prevent the jarring movement of the parts and also acts as an insulator between the plate 31 and the plate 16. The disk 3l is of less diameter than the interior of cap 3 and is adapted to be reciprocated in the chamber 26. The shaft 30 is hollow throughout a little over onehalf of the upper portion of its length, in which is located an interior shaft 33, which projects through and` above the disk 31 and is held by a nut 34 screwed upon the upper end thereof and above said disk 31. A portion 35 of said shaft 33 below the tubular portion 30 is of the same diameter as said tubular portion, said enlarged portion 35 terminating in what might be termed a downwardly extending hammer 36. This hammer may be solid, or it may have formed in its lower end a common tool-socket or chuck, in which tools of various forms may be placed and held so as to be reciprocated or otherwise moved with said reciprocating-shaft or core. The shaft 33, nut 34, enlarged portion 35and hammer 36 are all preferably made of brass, while the tubular shell 3Q and disk 31 are preferably made of soft iron. A coil spring 37 is located upon the hammer 36 and between the portion 35 and the end'of the counter bore 12 and necessarily determines the normal position ofthe shaft and disk for|ning a plunger, said normal position being with the upper end of said shaft in contact with the spring plate 27. A small block 3S of platinum is secured in the upper end of the shaft 33 and engages the platinum contact plate upon the lower side of the spring plate The upward movement of the plunger is limited by an adjustable set screw 39 having thumb nut 40 upon its upper end and a jam nut 41 upon its length to determine its stationary position as desired, said nut 41 being jammed against the portion 6 upon the plate 5. The downward adjustment of the screw 39 necessarily limits the upward movementof the plunger as it engages the spring plate 27 and forces the same downwardly, the length of the movement of said plunger being determined by the space which it has to reciprocate in, said space being between the plate 16 and the spring plate 27 as held by the screw 39. As seen in Fig. 8 the lower end of the screw 39 is provided with a projecting tip 42 made of yielding insulating' material and counter sunk into the end of said screw. The wire 43 which is secured under the head of the bolt 23 allows the passage of the current through said bolt into the spring plate 27, and from thence into Vthe shaft 33, and thence through the coiled spring 37`at the lower end of said hammer, and thence into the tool-socket 11, and thence through the lower and upper heads 16 of the magnet casing to the terminal 19 of the magnetwinc`ling,thence through said winding to the terminal 20 thereof. The current passing through these parts euergizes the coil. The energizing of the coil causes the same to act as a magnet and draws down the shaft and necessarily the disk 3l upon the upper end thereof the spring-plate 27 following said shaft downward and preserving the contact during a portion of the downward stroke. This operation compresses the spring 37 and the instant that the contact is broken between the upper end of the shaft 33 and the spring plate27, said spring forces the plunger upwardly again into contact with said plate. Y

The above operation is repeated as long as ICO the current is allowed in the tool, vbut said current can be cutout at any time by means of the switch 44.

In Figs. 5, 6, and 7 is shown a tool applied to a supporting construction by means of which the larger sizes of tools are held in position over the work upon which it is used and is especially designed for use when drilling large blocks of material, for boiler work, &c. It comprises two sets of inverted V- shaped standards 45 connected by longitudivnal pieces 46, the upper ends of said brackets providing bearings 47 in which alongitudinal shaft 48 is adapted to both revolve and reciprocate as desired.

The shaft 48 is provided intermediate of its length with a transverse bore 49, with abushing`50 located therein which acts as a` bearing for an eye bolt 5l the upper end of which provides a bearing52 -for a shaft 53 located at right angles with the shaft '48 but which may be changed to any angle with said shaft. A washer'54 is secured to the upper end of the bushing 50 and a washer 55 is secured under the head of the eye-bolt 5l and a nut 56 is located on the lower screw threaded end of the bolt 5l to prevent its withdrawalfrom its bearings. A set screw 57 projects through the head' of the bolt5l and is used incase it is desired to hold the shaft 53 in a stationary position. One end of said shaft 53 is provided'with a balance weight 58 while the opposite end of same has two projecting arms 59, which are securedto the shell `2 iusuch a manner that the complete electric tool is oscillatory.

It will be seen from the above description and by referenceto the drawings,'that the shaft 48 can be moved in its bearings 47 in a longitudinal horizontal manner and can be revolved as well, while the shaft 53 can be moved longitudinally through its bearing 52, j can be turned at any angle in a horizontal manner and similarly in a vertical manner.

The adjustment of the set-screw 39 regulates the length of movement of the reciprocatory plunger and the insulation tip upon the lower end of lsaid screw prevents the current from passing into the cap 3.

ln'Fig. 9, the hammer 36 is provided with a zig-zag channel or groove 60, which extends around the entire periphery of the shaft 36. A spring-controlled pin 6l normally engages in said groove 60, and with thel downward movement of the shaft, said groove travels over said pin, the pin being at the uppermost point of one of the angles formed by the zigzag, and when the shaft reciprocates up'- wardly, the pin engages in the next branch of the zig-zag groove and turns the shaft a prescribed distance, each reciprocatory movement of the shaft thus turning the same around. The object of thisconstruction is to equalize the wear upon'the lower end of the shaft, which acts as ,a hammer, striking a chisel or other common tool which is held within the counter bore y13.

Having fully described my invention, what Iclaimist 1. The improved electric-tool, comprising a solenoid, a plunger or tool-holder forming the core of said solenoid and reciprocative therein, said plunger being tubular, electrical connections between the windin g of said solenoid and a portion of said core, arranged to make and break the circuit in which these parts are located at each reciprocation of said core, a shaft located within said core to reciprocate therewith, ahammer or tool holder formed upon one end of this shaft an enlargement 35 on said shaft, a coiled-spring 37 located on this shaft inengagement with said enlargement and arranged to move said core and said shaft in one direction and in opposition to the power exerted by said solenoid, and means for limiting and adjusting the length of stroke of said core and shaft, substantially as herein specified.

2. An improved electric tool having a casing comprising a cylindrical shell open at both ends and normally closed by removable caps, a solenoid located within said cylindrical shell and normally secured tothe lower cap by screws, the core of said magnet comprising a tubular portionwith annular plates upon both ends, the inner Aend of the wire upon said coil secured tothe upper end plate and the other end of said magnet wire passing'through an opening in said shell'andinsulated therefrom, substantially as set forth.

3'. An improved electric tool, having a casing comprising a cylindical'portion adapted to receive the magnet coil, a lower end cap having a downwardlyY projecting port-ion provided with a bore and a counterbore, an upper end cap secured to said shell and having an upwardly extending portion providedwith a screw threaded aperture, through which a screw-threaded set screw is adapted to be reciprocated, a jam nut vlocated upon said set screw and adapted to be jammed against said upwardly projecting portion to determine the desired position of said set screw, the lower end of said set-screw provided with a projecting yielding insulation tip adapted to engage a spring contact plate, secured to andinsulated from the upper end cap, and a downward or upward adjustment of said set screw adapted to determine the length of stroke of a reciprocatory plunger located within the casing, substantially as set forth.

4. An improved electric tool having a casing comprising a cylindrical shell 2, an upper end cap 3 normally secured to said shell 2 by screws 9,V the upper end 5 of the saidcap 3 having an upwardly projecting portion 6 providedy with a vertically interior screw threaded opening 7, aset screw '39.adapted to be reciprocated in said opening 7, a jam nut 41 adapted to determine the position of said set screwby the jamming of same against the projection G, a magnet core'll located in the shell 2, a lower end cap 4 securedto said shell 2 by means of screws 14, a downwardly IIO depending central portion 11 upon said cap 4, a bore 12 in said projection 1l terminating in a counter bore 13, a reciprocatory plunger comprising a rod, the tubular portion 30 of which incases an interior shaft 33 made of brass or of some equally conductive material, upon the upper end of which is secured a disk 31 provided on its upper side with an insulated plate 32 made of some yielding material the lower portion of the plunger rod smaller than the main portion ofits length,a coil spring 37 located upon said portion 86 and in the bore 12, the tendency of said spring to keep said plunger upwardly in a chamber 26 formed between the upper end ofthe magnet 4 and the top plate 5 of the cap 3,aspring plate 27 secured to and insulated from said plate 5, a Wire 43 connecting with a bolt 23 passing through and insulated from the plate 5 and securing the spring plate 27 and the downward adjustment of the set screw 39 adapted to determine the length of stroke of said reciprocatory plunger, the lower end of said set screw provided with a yielding tip of insulating material, substantially as set forth.

5. An improved electric tool having a shaft comprising a portion of a plunger, reciprocatory within the magnet 4, said shaft having a downwardly projecting hammer provided near its lower end and in its periphery with a zig-zag groove 60 adapted to be engaged by a spring-controlled pin 61, located in the projection upon the lower cap, and a reciprocatory movement of said shaft adapted by the engagement of said pin in said groove, to turn said shaftwith each movement, substantially as set forth.

Intestimony whereof I aiiix my signature in presence of two Witnesses.

GEORGE II. VVILLAMS.

l/Vitnesses:

HERBERT S. ROBINSON, ALFRED A. EIcKs. 

